And here the details when pairing using the classic app:
9:34:20 PM: debug Creating event: [value:21, name:battery, descriptionText:IKEA TRÅDFRI Remote battery was 21%]
9:34:20 PM: debug Parsing message from device: ‘read attr - raw: 596B0100010A2100002015, dni: 596B, endpoint: 01, cluster: 0001, size: 0A, attrId: 0021, result: success, encoding: 20, value: 15’
9:34:19 PM: debug Parsing message from device: ‘catchall: 0104 0001 01 01 0140 00 596B 00 00 0000 07 01 00’
9:34:19 PM: debug Parsing message from device: ‘catchall: 0104 0001 01 01 0140 00 596B 00 00 0000 07 01 00’
9:34:16 PM: debug Configuring device TRADFRI remote control
9:34:15 PM: debug Creating child 5
9:34:15 PM: debug Creating child 4
9:34:15 PM: debug Creating child 3
9:34:15 PM: debug Creating child 2
9:34:15 PM: debug Creating child 1
9:34:15 PM: debug Creating 5 children